Well I am trying to have my cake and eat it too.

We dye our pond for swimming and looks. I only add the dye when the secchi gets to 8-10"s and even then the water is still aqua blue. It will drop to 18-20" after for a month or so. Then I add another pint. Might use a total of two pints all year on our one acre pond.

This is what I use. Natural blue.

[Linked Image from corvettejunkie.com]
http://www.pondboss.com/subscribe.asp?c=4


7/8th of an acre, Perch only pond, Ontario, Canada.